<?php
 class Page {
  private $total; //数据表中总记录数
  private $listRows; //每页显示行数
  private $limit;
  private $uri;
  private $pageNum; //页数
  private $config=array('header'=>"个记录", "prev"=>"上一页", "next"=>"下一页", "first"=>"首 页", "last"=>"尾 页");
  private $listNum=8;
  /*
   * $total
   * $listRows
   */
  public function __construct($total, $listRows=10, $pa=""){
   $this->total=$total;
   $this->listRows=$listRows;
   $this->uri=$this->getUri($pa);
   $this->page=!empty($_GET["page"]) ? $_GET["page"] : 1;
   $this->pageNum=ceil($this->total/$this->listRows);
   $this->limit=$this->setLimit();
  }

  private function setLimit(){
   return "Limit ".($this->page-1)*$this->listRows.", {$this->listRows}";
  }

  private function getUri($pa){
   $url=$_SERVER["REQUEST_URI"].(strpos($_SERVER["REQUEST_URI"], '?')?'':"?").$pa;
   //echo $url;
   $parse=parse_url($url);

 

   if(isset($parse["query"])){
    parse_str($parse['query'],$params);
    unset($params["page"]);
    $url=$parse['path'].'?'.http_build_query($params);

   }

   return $url;
  }

  public function __get($args){
   if($args=="limit")
    return $this->limit;
   else
    return null;
  }

  private function start(){
   if($this->total==0)
    return 0;
   else
    return ($this->page-1)*$this->listRows+1;
  }

  private function end(){
   return min($this->page*$this->listRows,$this->total);
  }

  private function first(){
   if($this->page==1)
    $html.='';
   else
    $html.="&nbsp;&nbsp;<a href='{$this->uri}&page=1'>{$this->config["first"]}</a>&nbsp;&nbsp;";

   return $html;
  }

  private function prev(){
   if($this->page==1)
    $html.='';
   else
    $html.="&nbsp;&nbsp;<a href='{$this->uri}&page=".($this->page-1)."'>{$this->config["prev"]}</a>&nbsp;&nbsp;";

   return $html;
  }

  private function pageList(){
   $linkPage="";

   $inum=floor($this->listNum/2);

   for($i=$inum; $i>=1; $i--){
    $page=$this->page-$i;

    if($page<1)
     continue;

    $linkPage.="&nbsp;<a href='{$this->uri}&page={$page}'>{$page}</a>&nbsp;";

   }

   $linkPage.="&nbsp;{$this->page}&nbsp;";


   for($i=1; $i<=$inum; $i++){
    $page=$this->page+$i;
    if($page<=$this->pageNum)
     $linkPage.="&nbsp;<a href='{$this->uri}&page={$page}'>{$page}</a>&nbsp;";
    else
     break;
   }

   return $linkPage;
  }

  private function next(){
   if($this->page==$this->pageNum)
    $html.='';
   else
    $html.="&nbsp;&nbsp;<a href='{$this->uri}&page=".($this->page+1)."'>{$this->config["next"]}</a>&nbsp;&nbsp;";

   return $html;
  }

  private function last(){
   if($this->page==$this->pageNum)
    $html.='';
   else
    $html.="&nbsp;&nbsp;<a href='{$this->uri}&page=".($this->pageNum)."'>{$this->config["last"]}</a>&nbsp;&nbsp;";

   return $html;
  }

  private function goPage(){
   return '&nbsp;&nbsp;<input type="text" onkeydown="javascript:if(event.keyCode==13){var page=(this.value>'.$this->pageNum.')?'.$this->pageNum.':this.value;location=\''.$this->uri.'&page=\'+page+\'\'}" value="'.$this->page.'" style="width:25px"><input type="button" value="GO" onclick="javascript:var page=(this.previousSibling.value>'.$this->pageNum.')?'.$this->pageNum.':this.previousSibling.value;location=\''.$this->uri.'&page=\'+page+\'\'">&nbsp;&nbsp;';
  }
  function fpage($display=array(0,1,2,3,4,5,6,7,8)){
   $html[0]="&nbsp;共有<b>{$this->total}</b>{$this->config["header"]}&nbsp;";
   $html[1]="&nbsp;每页显示<b>".($this->end()-$this->start()+1)."</b>条，本页<b>{$this->start()}-{$this->end()}</b>条&nbsp;";
   $html[2]="&nbsp;<b>{$this->page}/{$this->pageNum}</b>页&nbsp;";

   $html[3]=$this->first();
   $html[4]=$this->prev();
   $html[5]=$this->pageList();
   $html[6]=$this->next();
   $html[7]=$this->last();
   $html[8]=$this->goPage();
   $fpage='';
   foreach($display as $index){
    $fpage.=$html[$index];
   }
   return $fpage;
  }
 }

